Enhancing video presentation systems

ABSTRACT

A video system comprises a shared media accessor configured to access shared media. The shared media is configured to be displayed on a first display screen and a second display screen. A video accessor configured to access images from a first camera. A field of view of the first camera is oriented such that the first camera can capture the images comprising non-verbal communication of a user associated with the shared media. A video compositor configured to composite the images captured by the first camera and said shared media. The composited images are configured to be displayed on the second display screen.

BACKGROUND

Typically, in computer driven presentation systems, the presenter islimited to using audio and a cursor to convey ideas. An example of sucha system is the ubiquitous computer-projector presentation system. Insuch a system, the display screen is very large and placed in a locationso that it is clearly visible from all corners of the room. As a result,it impossible for a presenter to walk up to the display screen andinteract with gestures, gaze, and other forms of paralanguage.

Moreover, it is difficult for the audience to know what part of theslide the presenter is looking at when his/her back is turned to theaudience while interacting with the slide material. Also, the presenteris unable to see the audience when his/her back is turned to theaudience.

In some instances, video captures the presenter, slides and audience.Accordingly, the factors mentioned above, make it very difficult for auser viewing either a live feed or a recording to grasp interactionbetween all the components and participants of the presentation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 3A-F illustrate examples of video presentation systems, inaccordance to embodiments of the present invention.

FIG. 2 illustrates a video manipulator, in accordance to an embodimentof the present invention.

FIG. 4 illustrates an example of a flow chart of a method for enhancingvisual presentations, in accordance with an embodiment of the presentinvention.

The drawings referred to in this description should be understood as notbeing drawn to scale except if specifically noted.

DESCRIPTION OF EMBODIMENTS

Reference will now be made in detail to embodiments of the presenttechnology, examples of which are illustrated in the accompanyingdrawings. While the technology will be described in conjunction withvarious embodiment(s), it will be understood that they are not intendedto limit the present technology to these embodiments. On the contrary,the present technology is intended to cover alternatives, modificationsand equivalents, which may be included within the spirit and scope ofthe various embodiments as defined by the appended claims.

Furthermore, in the following description of embodiments, numerousspecific details are set forth in order to provide a thoroughunderstanding of the present technology. However, the present technologymay be practiced without these specific details. In other instances,well known methods, procedures, components, and circuits have not beendescribed in detail as not to unnecessarily obscure aspects of thepresent embodiments.

Embodiments of the present invention are directed to video presentationsystems. Video presentation systems attempt to recreate the best aspectsof actual face-to-face communications with respect to presentinginformation to an audience. It should be appreciated that a videopresentation system includes: a camera disposed at any location that iscapable of capturing images and/or audio (e.g. images/audio of a userand/or associated objects) to be transmitted to a corresponding displayscreen for viewing by an audience.

Specific examples will follow in which video presentation systemsinclude a camera that captures images through a display screen. It willbe understood that other video presentation systems can include camerasat any location. However, for the purposes of brevity and clarity,examples of video presentation systems will be used that capture imagesthrough a display screen.

Similarly, specific examples will follow in which video presentationsystems include a projector that projects images onto a back side of adisplay screen. It will be understood that other video presentationsystems can include a projector on the front side (e.g., same side asthe user). Moreover, video presentation systems may not include aprojector and images are displayed solely by a transparent displayscreen such as an organic light emitting diode (OLED) display screen.However, for the purposes of brevity and clarity, examples of videopresentation systems will be used that project images onto and through adisplay screen.

A discussion regarding embodiments of video presentation systems isprovided below. First, the discussion will describe the structure orcomponents of various embodiments of video presentation systems. Thenthe discussion will describe the operational description of the videopresentation systems.

FIG. 1 depicts an embodiment of video presentation system 100 at a firstlocation, in accordance to an embodiment of the present invention. Videopresentation system 100 includes a first display screen 110, projector120 and first camera 130. For purposes of brevity and clarity, a seconddisplay screen (at a second location) for viewing by an audience is notdepicted.

In one embodiment, a second location can be a remote location, forexample, a different city. In another embodiment, a second location canbe a location in proximity to the first location. For example, firstdisplay screen 110 can be at one location on a stage of an auditoriumand the second location is at another location on the stage. In anotherexample, first display screen 110 is one room in a building and thesecond display screen is at another room in the same building or anadjacent building.

Projector 120 is configured to project images, via projected light 125onto first display screen 110. In one embodiment, input 122 is streamingvideo data (that may also contain audio data) from a second locationreceived by projector 120 and subsequently projected through projector120 as images onto first display screen 110. In another embodiment,input 122 is shared media (e.g., PowerPoint slides) that areconcurrently displayed on first display screen 110 (viewed by presenter105) and a second display screen (viewed by an audience). It should beappreciated that presenter 105 is a user of video presentation system100.

First camera 130 is configured to capture light 131 at the firstlocation. The captured light is generated into capture images (e.g.,output 133) for subsequent transmission to another location(s). Firstcamera 130 may also include a microphone for capturing audio.Accordingly, output 133 includes audio data.

In one embodiment, first camera 130 captures images of non-verbalcommunication of presenter 105 corresponding to shared media displayedon first display screen 110. Non-verbal communication of presenter 105can be, but is not limited to, handwriting, pointing, touching, facialexpressions, hand movements, focused attention, gaze, posture and thelike.

In another embodiment, first camera 130 is further configured to capturelight from a light source (e.g., a laser pointer) to facilitate incapturing non-verbal communication of presenter 105. For example, ifpresenter 105 points at a graph displayed on a presentation slide, firstcamera 130 is able to determine where the laser beam from the laserpointer is hitting first display screen 110. Moreover, it is not arequirement for physical contact on first display screen 110 bypresenter 105 to generate gestures such as handwriting.

First display screen 110 is configured to display images. For example,images captured at a second location and/or shared media. In oneembodiment, display screen 110 is a rear projection display screencomprising a holographic screen material that diffuses light striking asurface from specific angles corresponding to the projector direction.

In another embodiment, display screen 110 is a transparent OLED displayscreen. In such an embodiment, video presentation system 100 does notrequire projector 120.

In various embodiments, video presentation system 100 employs opticsand/or hardware to separate and remove cross-talk signals (e.g.,backscattered light of projected light 125. For example, videopresentation system 100 employs, but is not limited to, (1) timemultiplexing, (2) polarization and (3) wavelength division multiplexing.In the various embodiments described this results in camera 130capturing an image of presenter 105, but not of the images displayed ondisplay screen 110.

In one embodiment, video presentation system 100 includes orthogonalpolarizing filters 170 and 180 to reduce video cross-talk. For example,filter 170 filters out horizontally propagating light and filter 180filters out vertically propagating light, or vice versa. As a result,video cross-talk is reduced.

In one embodiment, video presentation system 100 includes a touchsensing system. The touch sensing system is configured to sense thephysical touch by presenter 105. For example, if pressure is applied tofirst display screen 110, by presenter 105 touching the screen at pointx, the IR light is “frustrated” in the region of point x and thefrustrated IR light is emitted outside of first display screen 110 inthe region of point x. A touch camera (not shown) captures thefrustrated IR light and, accordingly, senses the region of contact x.

In another embodiment, touch sensing system includes a pressuresensitive film (not shown) that is applied to surface 112 of firstdisplay screen 110. If pressure is applied to first display screen 110at point x then a touch at point x is registered by the pressuresensitive film. In various embodiments, the physical touch of presenter105 can be sketching, pointing, handwriting and the like.

It should be appreciated that video presentation system 100 can includeany touch system (including the touch systems described above) that isable to sense touch by presenter 105. For example, video presentationsystem can also include a resistive touch system or a capacitive touchsystem.

FIG. 2 depicts video manipulator 240, in accordance to an embodiment ofthe present invention. Video manipulator 240 is configured to manipulateand combine video input 202 and shared media 204. Video manipulator 240includes video accessor 210, shared media accessor 215, content analyzer220 and video compositor 230.

Video accessor 210 is configured to access video input 202. In oneembodiment, video input 202 is output 133 of first camera 130. Inanother embodiment, video input 202 is output of a second cameraassociated with a second display screen, which will be described indetail below. This accessing can comprise passively receiving videoinput 202 or actively pulling or polling for video input 202.

Shared media accessor 215 is configured to access shared media 204.Shared media 204 can be, but is not limited to, PowerPoint slides,Keynote slides, video content, etc. This accessing can comprisepassively receiving shared media 204 or actively pulling or polling forshared media 204.

Content analyzer 220 is configured to generate alpha values. In oneembodiment, the generated alpha values are per-pixel alpha values. Inanother embodiment, the generated alpha values are single alpha values.In various embodiments, content analyzer 220 utilizes alpha blending orany Porter-Duff operations.

Video compositor 230 is configured to generate composed video 250 basedon video input 202 and shared media 204. For example, composed video 250is video input 202 overlaid with shared media 204 or vice versa. Videocompositor 230 can perform dynamic repositioning and blending of thevarious streams. Moreover, video compositor 230 may also perform astatic geometric transform of the video input to align the video of thepresenter with the shared media (e.g. remove barrel distortion due to awide-angle camera lens). Also, video compositor 230 mirrors the video ofthe presenter left to right so that their image aligns with the sharedcontent presented to the audience.

In embodiments in accordance with the present invention, shared media204 is optionally composited with video from first camera 130 fordisplay on second display screen 360.

In one embodiment, video compositor 230 utilizes rules in an RGBArepresentation where A represents an alpha channel with space and timevarying alpha values α(x, y, t) with x and y spatial pixel coordinates,and time t.

In another embodiment, video compositor 230 utilizes a global value ofα(x, y, t) (e.g., α=½). However, in such an embodiment, the global valuemay vary based on what is displayed/detected.

The α(x, y, t) values are tailored to preserve the contrast of thepresentation information, by analyzing the shared media colors for slidepresentations and preserving the lighter colors by setting α=max(R, G,B), where α represents the weight of the shared media.

In addition various image processing operations, such as desaturationand blur can be applied to the video of the speaker or shared media inorder to deemphasize one with respect to the other.

A variety of effects can be achieved by content analysis, includingcomputer vision and image analysis techniques. In one embodiment, slidetransitions are detected. Dissolves that start by fully presenting theslides and fading into an adaptive alpha blend highlight the informationin the slides at each transition, focusing on the viewer's attention.

In another embodiment, audio and video detection of the presenter isused to modify the alpha values to emphasize the speaker or emphasizethe shared media. This can be dependent on the presenter's gestures ormotions.

In a further embodiment, activity detection and spatial analysis of theshared media may be used to classify the shared media as slidepresentation or video. Different compositing treatment can be used foreach class of shared material.

In another embodiment, the size of the shared media may be automaticallyadjusted based on content analysis of the spatial frequencies in theshared media frames. For example, small font size media may be enlargedfor better visibility.

In one embodiment, depth based cameras may be used to blend presenterinformation when gestures are near the screen, emphasizing the gesturesinstead of the full presenter video.

In various embodiments, the compositing operation may be overridden orbe fully under interactive control of the presenter, the receivingaudience or a professional A/V technician. System modification is notrequired to allow control by the presenter or local A/V technician.However, providing control to the receiving audiences may requiremodifying the system to transmit separately the two video streams andconduct the compositing at the receiving processor.

FIGS. 3A-F depict various embodiments of video presentation systems. Thediscussion below describes the operational description of the variousembodiments of the video presentation systems.

FIG. 3A depicts video presentation system 300A, in accordance to anembodiment of the present invention. System 300A includes first displayscreen 110, projector 120 (not shown), first camera 130 (not shown) andsecond display screen 360. In one embodiment, second display screen 360is in a remote location. In another embodiment, second display screen360 is in a location in proximity to first display screen 110.

Second display screen 360 can be any display screen that is able todisplay video content. In one embodiment, a second projector (not shown)projects images onto second display screen. In another embodiment,second display screen 360 is a display screen similar to first displayscreen 110. For example, second display screen 360 can be a see-throughdisplay screen or a non see-through display screen. In a furtherembodiment, second display screen is a television.

Second display screen 360 is any size such that an audience viewingsecond display screen 360 is able to easily view shared media 204 anddisplayed non-verbal communication of presenter 105. First displayscreen 110 and second display screen 360 can be oriented in any positionwith respect to each such that audience 350A is able to view seconddisplay screen 360 and user 105 is able to interact with first displayscreen 110. In one embodiment, first display screen 110 is perpendicularto second display screen 360.

During use and operation of video presentation system 300A, presenter105 presents shared media 204 (e.g., PowerPoint slide) to audience 350A.Shared media 204 is displayed on first display screen 110 (via projector120 behind first display screen 110) and second display screen 360.

As presenter 105 faces first display screen 110 to interact with sharedmedia 204 in close range, first camera 130 (behind first display screen110) captures eye gaze and gestures in association to shared media 204.For example, when presenter 105 smiles while looking at and pointing atbox 315 of shared media 204, first camera 130 captures images 305A ofthe smile, eye gaze and pointing of presenter 105 with respect to sharedmedia 204.

Video manipulator 240 generates composed video 250 based on video input202 (output 133 of first camera 130) and shared media 204. Composedvideo 250 is displayed on second display screen 360. Composed video 250includes captured images 305A of the eye gaze and gestures overlaid withshared media 204. In other words, captured images 305A are superimposedor overlaid on shared media 204.

In one embodiment, if shared media 204 is not accessed or is not desiredto be displayed on second display screen 360, video manipulator 240outputs accessed video input 202 that is displayed on second displayscreen 360. In contrast, if video input 202 is not accessed or is notdesired to be displayed on second display screen 360, video manipulator240 outputs accessed shared media 204 that is displayed on seconddisplay screen 360.

As a result, audience 350A is able to view shared media 204 and eye gazeand gestures of presenter 105 associated with shared media 204 on seconddisplay screen 360 while presenter's 105 back is turned to audience350A. Thus, presenter 105 is able to communicate more naturally withrespect to shared media 204 to audience 350A.

FIG. 3B depicts video presentation system 300B, in accordance to anembodiment of the present invention. Video presentation system 300B issimilar to video presentation system 300A, however, video presentationsystem 300B also includes second camera 330.

Second camera 330 is configured to capture images of audience viewingsecond display screen 360. Second camera 330 is depicted being abovesecond display screen 360. However, second camera 330 can be located inany position such that second camera 330 is able to capture images ofaudience 350B. For example, second camera 330 can be located behindsecond display screen 360 and capture images through second displayscreen 360.

Use and operation of video presentation system 300B is the same as theuse and operation of video presentation system 300A, as described above.For example, audience 350B is able to view shared media 204 (not shown)and eye gaze and gestures of presenter 105 associated with shared media204 on second display screen 360 while presenter's 105 back is turned toaudience 350B. In particular, audience 350B is able to view eye gaze andhandwriting 316 of presenter 105 associated with shared media 204 (notshown) on second display screen 360 while presenter's 105 back is turnedto audience 350B.

Moreover, second camera 330 captures images of audience 350B. Forexample, second camera 330 captures the audience's reaction topresenter's 105 presentation.

Video manipulator 240 generates composed video 250 based on video input202 (output of second camera 330) and shared media 204. Composed video250 is displayed on first display screen 110. Composed video 250(displayed on first display screen 110) includes captured images ofcamera 330 overlaid with shared media 204. Composed video 250 (displayedon second display screen) includes and presenter's 105 gestures (e.g.,handwriting) associated with shared media 204.

In one embodiment, video manipulator 240 is utilized for generatingcomposed video for display on first display screen 110 and seconddisplay screen 360. In another embodiment, a first video manipulator isutilized for generating composed video for display on first displayscreen 110 and a second video manipulator is utilized for generatingcomposed video for display on second display screen.

As a result, presenter 105 is able to view audience 350B whilepresenter's 105 back is turned to audience 350B. Thus, presenter 105 isable to communicate more naturally with audience 350B and audience 350Bis able to communicate more naturally with presenter 105.

FIG. 3C depicts video presentation system 300C, in accordance to anembodiment of the present invention. Video presentation system 300C issimilar to video presentation system 300B, however, video presentationsystem 300C includes second display screen 360C at a remote locationwith respect to first display screen 110.

Use and operation of video presentation system 300C is similar to theuse and operation of video presentation system 300B, as described above.For example, camera 330 captures images of audience 350C and presenter105 is able to view audience 350C on first display screen 110.

However, first camera 130 captures images of audience 355C viewingpresenter 105 at first display screen 110. For example, first camera 130captures the audience's 355 reaction to presenter's 105 presentation.

Moreover, first camera 130 includes a broad viewing range. Inparticular, first camera 130 is able to capture images in a viewingrange laterally beyond the periphery of first display screen 110. Forexample, presenter 105 can interact with shared media (e.g., slides),move to either side of first display screen 110 to get a clear view ofaudience 355C, walk back to first display screen 110 to interact withshared media, all the while remaining in the view of first camera 130.

Video manipulator 240 generates composed video 250 based on video input202 (output 133 of camera 130) and shared media 204 (not shown).Composed video 250 is displayed on second display screen 360. Composedvideo 250 includes captured images of camera 130 overlaid with sharedmedia 204 and presenter's 105 gestures (not shown) associated withshared media 204.

As a result, presenter 105 and audience 355C are able to view audience350C (at a remote location) on first display screen 110. Likewise,audience 350C is able to view audience 355C and presenter 105 on seconddisplay screen 360. Thus, presenter 105 is able to communicate morenaturally with audience 350C and audience 350B is able to communicatemore naturally with presenter 105.

FIG. 3D depicts video presentation system 300D, in accordance to anembodiment of the present invention. Video presentation system 300D issimilar to video presentation system 300C, however, video presentationsystem 300D includes views of audiences from multiple remote sitescombined and displayed together.

Use and operation of video presentation system 300D is similar to theuse and operation of video presentation system 300C, as described above.For example, second camera 330 captures images of audience 350D andpresenter 105 is able to view audience 350D on first display screen 110.

However, first display screen 110 displays audience 350D and otheraudiences at other remote locations. Additionally, second display screen360 also displays the other audiences at the other remote locations.

As a result, presenter 105 is able to view audience 350D (at a remotelocation) and other audiences (at other remote locations) on firstdisplay screen 110. Likewise, audience 350D is able to view presenter's105 non-verbal communication and the other audiences (at other remotelocations) on second display screen 360. Thus, views of audiences arecombined for presenter 105 and each local audience sees presenter 105and combined view(s) of remote audience(s).

FIG. 3E depicts video presentation system 300E, in accordance to anembodiment of the present invention.

Video presentation system 300E includes first display screen 110 andsecond display screen 360. First display screen 110 and second displayscreen 360 are spatially coherent. For example, shared media 204displayed on first display screen 110 and/or gestures (e.g.,handwriting) associated with shared media 204 that are generated bypresenter 105 on display screen 110 can be scrolled to second displayscreen 360. In other words, presenter 105 is able to create and interactwith graphical content and scroll the content onto second display screen360.

As a result, first display screen 110 and second display screen 360 forma continuous scrolling canvas on which presenter 105 can create andscroll/translate/zoom graphical content. Moreover, an audience (notshown) is able to view the content on second display screen 360.

It should be appreciated that second display screen 360 can be locatedin any position (e.g., right side, left side) that allows for spatialcoherence between first display screen 110 and second display screen360.

FIG. 3F depicts video presentation system 300F, in accordance to anembodiment of the present invention. Video presentation system 300F issimilar to the previously described video presentation systems. However,presenter 105 is able to face audience 350F when interacting with sharedmedia 204. In particular, first display screen 110F is a transparentdisplay screen that is utilized as part of a podium. In variousembodiments, video presentation system 300F may or many not includesecond camera 330 (not shown).

During use and operation of video presentation system 300F, a field ofview of first camera 130F is oriented such that images captured by firstcamera 130F comprise non-verbal communication of a presenter 105associated with shared media 204. For example, first camera 130F islocated at a position that allows for first camera 130F to captureimages of presenter 105 smiling while pointing at shared media 104.

Moreover, the field of view of first camera 130F can be very broad. Forexample, first camera 130F is able to capture images of presenter 105interacting with shared media 204 on first display screen 110F, movingto either side of first display screen 110F to get a clear view ofaudience 350F, walking back to first display screen 110F to interactwith shared media 204, all the while remaining in the view of firstcamera 130F. In other words, first camera 130F is able to capture imagesof presenter 105 facing audience 350F and while presenter 105 is behind(or partially behind), beside, first display screen 110F. Additionally,first camera 130F is able to capture images of presenter 105 holding upan object (e.g., document). In one embodiment, first camera 130Fcaptures (1) non-verbal communication associated with shared media 204displayed on first display screen 110F and (2) the shared media 204displayed on first display screen 110F.

Video manipulator 240 generates composed video 250 based on video input202 and shared media 204. Composed video 250 is displayed on seconddisplay screen 360. Composed video 250 includes captured images of firstcamera 130F overlaid with shared media 204 and presenter's 105non-verbal communication associated with shared media 204.

As a result, audience 350F is able to view presenter's 105 non-verbalcommunication associated with shared media 204 (which is flippedhorizontally). Thus, presenter 105 is able to communicate more naturallywith audience 350F.

FIG. 4 depicts a method 400 for enhancing visual presentations, inaccordance with an embodiment of the present invention. In oneembodiment, method 400 is carried out by processors and electricalcomponents under the control of computer readable and computerexecutable instructions. The computer readable and computer executableinstructions reside, for example, in a data storage medium such ascomputer usable volatile and non-volatile memory. However, the computerreadable and computer executable instructions may reside in any type ofcomputer readable storage medium. In some embodiments, method 400 isperformed at least by video presentation systems described in FIGS.1-3F.

At 410 of method 400, shared media 204 is accessed. In one embodiment,shared media 204 is configured to be displayed on a first display screen110 and a second display screen 360.

At 420 of method 400, images from a first camera 130 are accessed. Afield of view of first camera 130 is oriented such that images capturedby first camera 130 comprise non-verbal communication of a userassociated with shared media 204.

In one embodiment, at 422 of method 400, the images are accessed throughfirst display screen 110 and captured by the first camera 130.

At 430 of method 400, the images captured by first camera 130 and sharedmedia 204 are composited.

At 440 of method 400, composited images captured by first camera 130 andshared media 204 are displayed on second display screen 360.

At 450 of method 400, images captured by second camera 330 are accessed.Second camera 330 is associated with second display screen 360. In oneembodiment, at 455 of method 400, wherein the images comprise anaudience viewing second display screen 360.

At 460 of method 400, images captured by second camera 330 and sharedmedia 204 are composited. The second camera is associated with seconddisplay screen 360.

At 470 of method 400, composited images are displayed on first displayscreen 110. The composited images comprise images captured by secondcamera 330 and shared media 204. Second camera 330 is associated withsecond display screen 360.

Various embodiments of the present invention are thus described. Whilethe present invention has been described in particular embodiments, itshould be appreciated that the present invention should not be construedas limited by such embodiments, but rather construed according to thefollowing claims.

The invention claimed is:
 1. A non-transitory computer useable storagemedium having computer readable program code embedded therein for avideo presentation system executing in a computer system, comprising: ashared media accessor configured to access shared media, wherein saidshared media is displayed on a first display screen and on a seconddisplay screen; a video accessor configured to access images captured bya first camera, wherein a field of view of said first camera is orientedsuch that said images captured by said first camera comprise at leastone person associated with said shared media and non-verbalcommunication thereof and configured to access images captured by asecond camera, wherein a field of view of said second camera is orientedsuch that said images captured by said second camera comprise at leastone person associated with said shared media and non-verbalcommunication thereof, wherein said at least one erson comprises atleast one of a presenter and an audience; and a video compositorconfigured to composite said images captured by said first camera andsaid shared media to achieve first composited images, wherein said firstcomposited images are displayed on said second display screen andconfigured to composite said images captured by said second camera andsaid shared media to achieve second composited images, wherein saidsecond composited images are displayed on said first display screen,wherein a surface of said first display screen that displays said secondcomposited images is facing at least said presenter in the samedirection as said first camera faces, and wherein a surface of saidsecond display screen that displays said first composited images isfacing at least said audience in the same direction as said secondcamera faces.
 2. The non-transitory computer useable storage medium ofclaim 1, wherein said first display screen is a see-through displayscreen.
 3. The non-transitory computer useable storage medium of claim1, comprising: a content analyzer configured to generate per pixel alphavalues.
 4. A method for enhancing visual presentations, said methodcomprising: accessing shared media, wherein said shared media isdisplayed on a first display screen and a second display screen;accessing images captured by a first camera, wherein a field of view ofsaid first camera is oriented such that said images captured by saidfirst camera comprise at least one person associated with said sharedmedia and nonverbal communication thereof and configured to accessimages captured by a second camera, wherein a field of view of saidsecond camera is oriented such that said images captured by said secondcamera comprise at least one person associated with said shared mediaand nonverbal communication thereof, wherein said at least one personcomprises at least one of a presenter and an audience; compositing saidimages captured by said first camera and said shared media to achievefirst composited images; compositing said images captured by said secondcamera and said shared media to achieve second composited images;displaying said first composited images on said second display screen,wherein a surface of said second display screen that displays said firstcomposited images is facing at least said audience in the same directionas said second camera faces; and displaying said second compositedimages on said first display screen, wherein a surface of said firstdisplay screen that displays said second composited images is facing atleast said presenter in the same direction as said first camera faces.5. The method of claim 4, wherein said accessing images comprises:accessing said images through said first display screen and captured bysaid first camera.
 6. The method of claim 4, wherein said non-verbalcommunication associated with said shared media are a group of gesturesconsisting of: hand-writing, pointing, touching, facial expressions,hand movements and focused attention.
 7. The method of claim 4, whereinsaid captured images from said first camera comprises: captured imagesfrom a viewing range that laterally extends beyond a periphery of saidfirst display screen.